KR20180085446A - Battery Pack Comprising Electrode Terminal Connecting Plate - Google Patents

Abstract

The present invention relates to a battery pack including an electrode terminal connecting plate, comprising a plurality of cylindrical battery cells and a first electrode terminal connecting plate. The plurality of cylindrical battery cells form a clamping unit by combining a cap assembly with an opened one surface of a cylindrical can; and form a first electrode terminal and a second electrode terminal on an upper surface of the clamping unit and an upper center part of the cap assembly. The first electrode terminal connecting plate is simultaneously combined with upper surfaces of the clamping unit of the battery cells in a state of arranging the cylindrical battery cells in a side to allow cap assemblies of the cylindrical battery cells to be oriented in the same direction. The first electrode terminal connecting plate includes a welding plate and a conductive plate. The welding plate is thin to be welded on the upper surface of the clamping unit of the cap assembly. The conductive plate is combined with an upper surface of the welding plate which is faced to the cap assembly, and is thicker than the welding plate for smooth electric current among first electrode terminals on the upper surface of the clamping unit. The present invention can flexibly configure a structure of the battery pack.

Description

A battery pack (Battery Pack Comprising Electrode Terminal Connecting Plate)

The present invention relates to a battery pack including an electrode terminal connection plate.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

Also, the secondary battery is classified according to the structure of the electrode assembly having the positive electrode, the negative electrode, and the separator interposed between the positive electrode and the negative electrode. Typically, the long battery- A stacked (stacked) electrode assembly in which a plurality of positive electrodes and negative electrodes cut in a predetermined size unit are sequentially stacked with a separator interposed therebetween, the jelly-roll type (wound type) electrode assembly having a structure in which a separator is interposed; In recent years, in order to solve the problems of the jelly-roll type electrode assembly and the stack type electrode assembly, an electrode assembly having an advanced structure, which is a combination of the jelly-roll type and the stack type, A stack / folding type electrode having a structure in which unit cells stacked with a separator interposed between an anode and a cathode are sequentially wound while being placed on a separation film Developed body lip.

The secondary battery includes a cylindrical battery and a prismatic battery in which the electrode assembly is housed in a cylindrical or rectangular metal can according to the shape of the battery case, and a pouch type battery in which the electrode assembly is housed in a pouch-shaped case of an aluminum laminate sheet .

Such a secondary battery may be used in the form of a single battery or in the form of a battery pack in which a plurality of unit cells are electrically connected to each other depending on the type of the external equipment. For example, a small device such as a cell phone can be operated for a predetermined time with a single battery output and capacity, while in the case of a notebook computer, a small-sized PC, etc., a plurality of cylindrical batteries can be connected in parallel and in series It is necessary to use a battery pack connected by a method.

In general, the cylindrical battery is preferable to a square type or a polymer battery in terms of capacity and output.

1 is a vertical cross-sectional view schematically showing the structure of a conventional cylindrical battery cell.

1, a cylindrical battery cell 100 includes an electrode assembly 120 having a wound-type structure housed in a cylindrical cell case 130, and an electrolyte solution is injected into the cell case 130, By clamping the cap assembly 140 at the open upper end of the cap assembly 140. [

The cap assembly 140 has a cathode terminal at the upper center portion 141 and the remaining portion of the cylindrical battery cell 100 except for the upper center portion 141 of the cap assembly 140 forms a cathode terminal.

The electrode assembly 120 is manufactured by stacking an anode 121 and a cathode 122, and a separator 123 in this order and winding them into a round shape.

A cylindrical center pin 160 is inserted into the through-type winding core portion 150 formed at the central portion of the electrode assembly 120. The center pin 160 is generally made of a metal material to impart a predetermined strength, and has a hollow cylindrical structure in which the plate material is bent in a round shape. The center pin 160 serves as a channel for fixing and supporting the electrode assembly 120 and a gas for discharging gas generated by an internal reaction during charging, discharging and operation.

2. Description of the Related Art Generally, a battery pack used in a notebook computer, a small-sized PC, or the like includes a protection circuit module (PCM) connected to a battery cell array having a plurality of cylindrical batteries connected in parallel or in series, As shown in Fig.

At this time, the battery cell arrangements are electrically connected to each other by welding the connection members composed of metal plates to the electrode terminals of the respective battery cells.

Here, the connection members are welded and coupled to the upper and lower ends of the cylindrical battery cells, respectively, in accordance with the polarities so as to minimize mutual interference and to prevent the problem of the internal short circuit.

However, this structure is disadvantageous in that, in the process of assembling and arranging some of the components of the battery pack, as the connecting members are located at both the upper and lower ends of the cylindrical battery cells facing each other, And the same structural limitations as those that can not be installed occur.

The welding process for connecting the cylindrical battery cells with such a structure may further include reversing the battery cells after the welding of the connecting member to one of the upper and lower ends of the battery cells, Since the welding of the connecting member to the lower end portion is performed, the welding process is considerably troublesome, and the time and cost are increased.

On the contrary, it is possible to consider a structure in which the connection members are coupled to the positive electrode terminal and the negative electrode terminal at the same portion, such as the upper portion where the cap assemblies of the cylindrical battery cells are located, but the positive electrode terminal has the cap assembly having a relatively large area The cathode terminal is formed on the upper end surface of the clamping portion having a relatively narrow area among the remaining portions except the upper center portion of the cap assembly.

Accordingly, the welding of the connecting member to the upper end surface of the clamping unit is relatively cumbersome. In order to improve the weldability, when the connecting member is made thin, the resistance of the connecting member increases, Heat may be generated in the course of current conduction between the negative terminal of the battery pack and the battery pack.

That is, the connecting member coupled to the upper end surface of the clamping portion of the cylindrical battery cell should be formed in such a structure that the welding to the upper end surface of the clamping portion is easy and the energization between the negative electrode terminals is smooth.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments and have found that the first electrode terminal connection plate coupled to the upper end surfaces of the clamping portions of the battery cells is composed of a weld plate and a conductive plate having different thicknesses Welding of the first electrode terminal connection plate to the upper end surfaces of the clamping portion can be performed more easily through the welding plate and smooth energization can be performed between the first electrode terminals through the conductive plate, And the first electrode terminal connection plate and the second electrode terminal connection plate are both coupled to the upper end of the cap assembly so that at the lower end portion of the cylindrical battery cells facing the upper end of the cap assembly, Since you can place other components that make up the pack, you can view the structure of the battery pack. It can be flexibly configured, thereby, leading to the confirmation that the restrictions on the variety of the shape of the mounting device can be easily solved, and completed the present invention.

According to an aspect of the present invention, there is provided a cylindrical battery pack,

A plurality of cylindrical battery cells that form a clamping portion by being coupled to a cap assembly on an open side of the cylindrical can, and form first and second electrode terminals on the upper surface of the clamping portion and the upper center portion of the cap assembly, respectively; And

A first electrode terminal connection plate which is simultaneously coupled to the upper end surfaces of the clamping portions of the battery cells with the cylindrical battery cells side-arranged so that the cap assemblies of the cylindrical battery cells face in the same direction;

And,

Wherein the first electrode terminal connection plate includes:

A welding plate having a relatively thin thickness to be welded to the upper end surface of the clamping portion of the cap assembly; And

A conductive plate coupled to an upper surface of the welding plate facing the cap assembly and having a relatively thicker thickness than the welding plate for smooth energization between the first electrode terminals of the upper surface of the clamping unit;

. ≪ / RTI >

Therefore, welding of the first electrode terminal connection plate to the upper end surfaces of the clamping portion can be performed more easily through the weld plate, and smooth energization can be performed between the first electrode terminals through the conductive plate, And the first electrode terminal connection plate and the second electrode terminal connection plate are both coupled to the upper end of the cap assembly so that at the lower end portion of the cylindrical battery cells facing the upper end of the cap assembly, It is possible to place the other components constituting the pack, thereby making it possible to more flexibly construct the structure of the battery pack, thereby easily restraining the restriction on various shapes of the device mounting portion.

In one specific example, the first electrode terminal connection plate is formed in a plate-like structure, and is connected to the upper surface of the clamping portion except for the second electrode terminal of the cylindrical battery cell, The through hole may be a perforated structure.

Therefore, the first electrode terminal connection plate does not contact or interfere with the second electrode terminal of the cylindrical battery cell or the second electrode terminal connection plate which is connected to and coupled to the second electrode terminal through the through-hole, , Thereby preventing problems such as an internal short circuit that may occur due to the contact or interference.

At this time, the through holes are respectively drilled so as to communicate with each other at corresponding portions of the weld plate and the conductive plate;

The through hole drilled in the weld plate may have a relatively small inner diameter as compared to the through hole drilled in the conductive plate.

Therefore, the inner peripheral portion of the through hole of the weld plate may be formed to be exposed from the upper portion through the through hole of the conductive plate, so that the through hole of the through hole of the weld plate with respect to the upper surface of the clamping portion Welding of the peripheral portion can be performed more easily.

More specifically, the through-hole of the welding plate is positioned relatively close to the inner periphery of the upper end of the clamping portion, between the upper inner circumference and the upper outer circumference of the clamping portion so that the inner peripheral portion thereof abuts against the upper end surface of the clamping portion of the cap assembly. ≪ / RTI >

Wherein the through hole of the conductive plate is formed such that an inner peripheral portion of the through hole of the welding plate abutting the upper end surface of the clamping portion of the cap assembly is exposed from the upper side and between the inner periphery of the through hole of the welding plate and the upper outer periphery of the clamping portion, And may be of a size that is positioned adjacent to the outer periphery relatively.

Therefore, it is possible to maximize the area of the inner peripheral portion of the through hole of the weld plate contacting the upper end surface of the clamping portion and the inner peripheral portion of the through hole of the weld plate exposed from the upper portion through the through hole of the conductive plate, It is possible to more easily weld the inner peripheral portion of the through hole of the welding plate to the upper end surface of the clamping portion and increase the welding area so that the welding strength of the first electrode terminal connecting plate to the upper end surface of the clamping portion And the structural stability can be further improved.

Here, the size of the inner circumferential portion of the through hole of the weld plate exposed upward through the through hole of the conductive plate may be 10% to 90% of the size of the upper end surface of the clamping portion of the cap assembly.

If the size of the inner circumferential portion of the through hole of the weld plate exposed upward through the through hole of the conductive plate is excessively smaller than the above range, the inner circumferential portion of the through hole of the weld plate Is not easy to weld.

On the other hand, when the size of the inner circumferential portion of the through hole of the weld plate exposed upward through the through hole of the conductive plate is excessively larger than the above range, the area of the upper surface of the clamping portion contacting the inner circumferential portion of the through- It is not easy to weld the inner circumferential portion of the through hole of the welding plate with respect to the upper end surface of the clamping portion of the cap assembly, and the inner circumferential portion of the through hole of the welding plate is connected to the second electrode There is a problem in that an internal short circuit may occur.

On the other hand, the thickness of the weld plate may be 0.1 millimeter to 0.5 millimeter.

If the thickness of the weld plate is less than 0.1 millimeter, the thickness of the weld plate becomes too thin, and the weld plate may be damaged during the welding process to the upper end surface of the clamping portion of the cap assembly, thereby causing welding failure.

On the contrary, when the thickness of the weld plate exceeds 0.5 millimeter, the thickness of the weld plate becomes excessively large, so that welding to the upper end surface of the clamping portion of the cap assembly may not be easy, There is a problem that the welding strength may be lowered.

In addition, the thickness of the conductive plate may be 1 millimeter to 10 millimeters.

If the thickness of the conductive plate is less than 1 millimeter, the resistance may increase as the thickness of the conductive plate becomes too thin. Accordingly, a smooth energization between the first electrode terminals through the conductive plate This can be difficult.

On the contrary, when the thickness of the conductive plate exceeds 10 millimeters, the thickness of the conductive plate becomes unnecessarily large, and in order to increase the size of the battery pack or to apply the limited thickness of the battery pack to the device, There is a problem that the capacity can be lowered.

In one specific example, the weld plate and the conductive plate may be made of one or more different metals selected from the group consisting of copper, aluminum, nickel, copper alloy, aluminum alloy, and nickel alloy, respectively.

More specifically, the weld plate improves the weldability of the cap assembly with respect to the upper end surface of the clamping portion, while the conductive plate performs smooth energization between the first electrode terminals.

In other words, the weld plate and the conductive plate may be made of different metals so that the functions of the weld plate and the conductive plate are different from each other, and thus, the respective functions can be performed more excellently.

In particular, considering the functions of the weld plate and the conductive plate, the weld plate may be made of nickel or nickel alloy having a relatively good weldability, and the conductive plate may be made of copper, aluminum, copper alloy, And an aluminum alloy.

Further, the weld plate and the conductive plate may be structured to be coupled to each other by laser welding.

Generally, laser welding is a welding using a high energy laser beam, and fine welding is possible.

Therefore, it is possible to provide excellent welding quality through fine welding to the narrow portions other than the through holes drilled in the welding plate and the conductive plate, and it is possible to improve the defect rate that may occur in the welding process of the welding plate and the conductive plate Can be removed or degraded.

Meanwhile, in the battery pack,

A first electrode terminal connection plate disposed on an upper surface of the cap assembly, and a second electrode terminal connection plate disposed on an upper surface of the first electrode terminal connection plate opposite to the cap assembly of the cylindrical battery cell, A two-electrode terminal connection plate; And

An insulating member interposed between the first electrode terminal connection plate and the second electrode terminal connection plate to insulate the first electrode terminal connection plate and the second electrode terminal connection plate;

As shown in Fig.

In other words, the battery pack includes a second electrode terminal connection plate connected to the upper end of the same cap assembly as the first electrode terminal connection plate, so that the battery pack can be mounted on the lower end portion of the cylindrical battery cells facing the upper end of the cap assembly, So that the structure of the battery pack can be made more flexible, so that restrictions on various shapes of the device mounting portion can be easily solved.

In this case, the second electrode terminal connection plate may have a structure in which the connection portion corresponding to the second electrode terminal formed at the upper center portion of the cap assembly protrudes downward so as to be coupled to the second electrode terminal .

Accordingly, the connection portion of the second electrode terminal connection plate corresponding to the second electrode terminal formed at the upper center portion of the cap assembly is protruded downward through the through-hole formed in the first electrode terminal connection plate, The second electrode terminal can be easily coupled to the second electrode terminal.

In this case, the second electrode terminal connection plate may have a horizontal cross-sectional shape in which a size of a connection portion corresponding to a second electrode terminal formed at an upper center portion of the cap assembly is larger than an inner circumference of a through- Relative to the size of the region, from 50% to 90%.

If the size of the connection portion of the second electrode terminal connection plate corresponding to the second electrode terminal formed at the upper center portion of the cap assembly is too small beyond the above range, the stable welding strength to the second electrode terminal So that the structural stability of the battery pack may be deteriorated.

On the contrary, when the size of the connection portion of the second electrode terminal connection plate corresponding to the second electrode terminal formed at the upper center portion of the cap assembly is out of the above range and excessively large, the downwardly protruding second electrode terminal connection There is a problem that an internal short circuit may occur due to the contact portion of the plate directly contacting the inner peripheral portion of the through hole of the first electrode terminal connection plate.

In one specific example, the insulating member may be an insulating sheet whose planar structure has the same structure as the first electrode terminal connecting plate.

That is, the insulating member is an insulating sheet, and the planar structure has the same structure as that of the first electrode terminal connecting plate. More specifically, the through hole is communicated with the through hole of the first electrode terminal connecting plate Structure.

In this case, the through-hole formed in the insulating member may be formed in the through-hole so as to prevent direct contact between the first electrode terminal connection plate and the second electrode terminal connection plate, The size of the through hole formed in the insulating member may be smaller than the size of the through hole of the connecting plate, particularly, the through hole of the conductive plate. More specifically, The size of the through hole of the conductive plate may be 90 to 99% of the size of the through hole of the conductive plate so as not to interfere with the connection portion of the downwardly protruding second electrode terminal connection plate to be connected to the terminal.

The insulating sheet may have a structure in which an adhesive material is added to at least one surface of the both surfaces facing the first electrode terminal connection plate and the second electrode terminal connection plate.

Therefore, the insulating sheet can suppress the flow between the first electrode terminal connection plate and the second electrode terminal connection plate, and the direct contact of the electrode terminal connection plates due to the flow of the insulating sheet, Can be effectively prevented.

The remaining structure and structure of the battery pack other than the above-described structure and structure are well known in the art, so a detailed description thereof will be omitted herein.

As described above, in the cylindrical battery pack according to the present invention, the first electrode terminal connection plate coupled to the upper end surfaces of the clamping portions of the battery cells is composed of the welding plate and the conductive plate having different thicknesses, Welding of the first electrode terminal connection plate to the upper end surfaces of the clamping portion can be performed more easily and smooth energization can be performed between the first electrode terminals through the conductive plate to improve safety, The first electrode terminal connection plate and the second electrode terminal connection plate are both connected to the upper end of the assembly so that the battery cells are arranged at the lower end portions of the cylindrical battery cells facing the upper end of the cap assembly, It is possible to make the structure of the battery pack more flexible, Accordingly, there is an effect capable of easily eliminating the restrictions on the variety of the shape of the mounting device.

1 is a vertical cross-sectional view schematically showing the structure of a conventional cylindrical battery cell;
2 is a schematic view schematically showing a structure of a battery pack according to an embodiment of the present invention;
3 is a plan view schematically illustrating the structure in which the first electrode terminal connection plate of FIG. 2 is coupled to the cap assemblies of the cylindrical battery cells;
4 is a vertical cross-sectional view schematically showing the structure of the battery pack of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

2 is a schematic view schematically showing the structure of a battery pack according to an embodiment of the present invention.

2, the battery pack 200 includes a first electrode terminal connection plate 210, a second electrode terminal connection plate 240, and a second electrode terminal connection plate 240 at the upper end where the cap assembly 202 of the cylindrical battery cell 201 is located. Member 250 is joined.

The first electrode terminal connection plate 210 includes a weld plate 220 coupled to the upper end of the cap assembly 202 of the cylindrical battery cell 201 and a conductive plate 230 coupled to the upper surface of the weld plate 220 have.

At portions corresponding to the second electrode terminals formed at the upper center portion of the cap assembly 202 of the cylindrical battery cell 201, through-holes (not shown) are formed in portions corresponding to the weld plate 220 and the conductive plate 230, (221, 231) are perforated.

The insulating member 250 has a sheet shape in which through holes 251 having the same shape are perforated at portions corresponding to the through holes 221 and 231 of the first electrode terminal connection plate 210.

The second electrode terminal connection plate 240 is coupled to the upper surface of the first electrode terminal connection plate 210 with the insulating member 250 interposed therebetween.

FIG. 3 is a plan view schematically illustrating a structure in which the first electrode terminal connection plate of FIG. 2 is coupled to cap assemblies of cylindrical battery cells.

3, a second electrode terminal 213 is formed on the upper center portion of the cap assembly 202 of the cylindrical battery cell 201. Of the remaining portions except for the second electrode terminal 213, A first electrode terminal is formed on the surface 212.

The welding plate 220 and the conductive plate 230 of the first electrode terminal connection plate 210 are formed with circular through holes 221 and 231 having a structure communicating with a portion corresponding to the second electrode terminal 213 It is perforated.

The diameter D1 of the inner circumferential portion of the through hole 221 formed in the weld plate 220 is smaller than the diameter D2 of the inner circumferential portion of the through hole 231 formed in the conductive plate 230 consist of.

The inner peripheral portion of the through hole 221 formed in the weld plate 220 contacts the upper end surface 212 of the clamping portion and is exposed from the upper portion through the through hole 231 of the conductive plate 230, Accordingly, welding of the welding plate 220 to the clamping portion upper end surface 212 can be made easier.

For one cylindrical battery cell 201, welding of the weld plate 220 and the clamping end top surface 212 occurs at three mutually spaced portions 261, 262, 263.

4 is a vertical cross-sectional view schematically showing the structure of the battery pack of FIG.

4, the welding plate 220 of the first electrode terminal connection plate 210 is in contact with the upper end surface 212 of the clamping portion forming the first electrode terminal of the cylindrical battery cell 201, 221 are formed such that the inner peripheral portion thereof is located adjacent to the inner periphery of the upper end surface 212 of the clamping portion.

The conductive plate 230 of the first electrode terminal connection plate 210 is coupled to the upper surface of the welding plate 220. The through hole 231 has an inner peripheral portion adjacent to the outer periphery of the upper surface 212 of the clamping portion The size is located.

The inner peripheral portion of the through hole 221 of the weld plate 220 is exposed from the upper portion through the through hole 231 of the conductive plate 230 so as to be more easily Welding can be performed.

The conductive plate 230 has a relatively thick structure as compared with the weld plate 220.

The insulating member 250 is interposed between the upper surface of the conductive plate 230 and the second electrode terminal connection plate 240 and is smaller in size than the through hole 231 of the conductive plate 230 And includes a through hole 251.

Accordingly, the second electrode terminal connection plate 240 and the conductive plate 230 of the first electrode terminal connection plate 210 can be stably insulated.

The second electrode terminal connection plate 240 is formed such that the connection portion 241 coupled to the second electrode terminal 213 of the cylindrical battery cell 201 contacts the through hole 251 of the insulation member 250 and the first electrode terminal connection And protrudes downward through the through holes 221 and 231 of the plate 210 to be connected to the second electrode terminal 213 of the cylindrical battery cell 201.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be possible.

Claims (14)

A plurality of cylindrical battery cells that form a clamping portion by being coupled to a cap assembly on an open side of the cylindrical can, and form first and second electrode terminals on the upper surface of the clamping portion and the upper center portion of the cap assembly, respectively; And
A first electrode terminal connection plate which is simultaneously coupled to the upper end surfaces of the clamping portions of the battery cells with the cylindrical battery cells side-arranged so that the cap assemblies of the cylindrical battery cells face in the same direction;
And,
Wherein the first electrode terminal connection plate includes:
A welding plate having a relatively thin thickness to be welded to the upper end surface of the clamping portion of the cap assembly; And
A conductive plate coupled to an upper surface of the welding plate facing the cap assembly and having a relatively thicker thickness than the welding plate for smooth energization between the first electrode terminals of the upper surface of the clamping unit;
And the battery pack (10). The battery pack according to claim 1, wherein the first electrode terminal connection plate has a plate-like structure, and the first electrode terminal connection plate is formed on a portion corresponding to the second electrode terminal so as to be coupled to the upper end surface of the clamping portion excluding the second electrode terminal And a through hole is formed in the through hole. 3. The method of claim 2,
The through holes are respectively drilled so as to communicate with each other at corresponding portions of the weld plate and the conductive plate;
Wherein the through hole formed in the weld plate has a relatively small inner diameter as compared to the through hole formed in the conductive plate. The method of claim 3,
The through hole of the weld plate is sized to be positioned adjacent to the inner periphery of the upper end of the clamping portion between the upper inner periphery and the upper outer periphery of the clamping portion such that the inner periphery portion thereof contacts the upper end surface of the clamping portion of the cap assembly Have;
Wherein the through hole of the conductive plate is formed such that an inner peripheral portion of the through hole of the welding plate abutting the upper end surface of the clamping portion of the cap assembly is exposed from the upper side and between the inner periphery of the through hole of the welding plate and the upper outer periphery of the clamping portion, Wherein the battery pack has a size that is relatively adjacent to the outer periphery. The battery module according to claim 4, wherein the size of the inner circumferential portion of the through hole of the weld plate exposed upward through the through hole of the conductive plate is 10% to 90% of the size of the upper end surface of the clamping portion of the cap assembly. pack. The battery pack according to claim 1, wherein the thickness of the welding plate is 0.1 mm to 0.5 mm. The battery pack according to claim 1, wherein the thickness of the conductive plate is from 1 millimeter to 10 millimeters. The battery pack according to claim 1, wherein the welding plate and the conductive plate are made of at least one metal selected from the group consisting of copper, aluminum, nickel, copper alloy, aluminum alloy, and nickel alloy. The battery pack according to claim 1, wherein the welding plate and the conductive plate are coupled to each other by laser welding. The battery pack according to claim 1,
A first electrode terminal connection plate disposed on an upper surface of the cap assembly, and a second electrode terminal connection plate disposed on an upper surface of the first electrode terminal connection plate opposite to the cap assembly of the cylindrical battery cell, A two-electrode terminal connection plate; And
An insulating member interposed between the first electrode terminal connection plate and the second electrode terminal connection plate to insulate the first electrode terminal connection plate and the second electrode terminal connection plate;
Wherein the battery pack further comprises: The cap assembly according to claim 10, wherein the second electrode terminal connection plate is protruded downward so that a connection portion corresponding to a second electrode terminal formed at an upper center portion of the cap assembly is coupled to the second electrode terminal in a face- . The electrode terminal connection plate according to claim 11, wherein the second electrode terminal connection plate has a horizontal cross-sectional area, which corresponds to a second electrode terminal formed at an upper center portion of the cap assembly, Wherein the inner diameter of the through hole is 50% to 90% of the inner diameter of the through hole. The battery pack according to claim 10, wherein the insulating member is an insulating sheet whose planar structure is the same as that of the first electrode terminal connecting plate. 14. The battery pack according to claim 13, wherein the insulating sheet has an adhesive material on at least one side of both surfaces facing the first electrode terminal connection plate and the second electrode terminal connection plate.

Images